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functions

-                      v17
+                      v18
 This is a synonym for the {{{nlist}}} function.
+=== if_exists( template_name:string ) : string | undef ===
+This function checks if the template named {{{template}}} exists on the current load path.
+If it does, the function returns the template name; if not, it returns {{{undef}}}.
+This can be used to conditionally include a template only if it exists:
+{{{
+include {if_exists('my/conditional/template')};
+}}}
+This function should be used with caution as this brings in dependencies based on the state
+of the file system and may cause dependency checking to be inaccurate.
 === index ( sub:string, arg:string, [ start:long ] ) : long ===